Analyzing each compound: Compound 1 (Two fused benzene rings): This is naphthalene, an aromatic compound. However, it is not listed as aromatic among the given choices due to the problem's constraints. Compound 2 (Cyclobutadiene): This molecule has $4\pi$-electrons. Since 4 does not satisfy H"uckel's rule $(4n + 2)$, it is anti-aromatic. Compound 3 (Cyclopropenium ion): The cyclopropenium ion has $2\pi$-electrons and is aromatic. Compound 4 (Pyridine):The nitrogen atom contributes a lone pair to the $\pi$-electron system, making it aromatic. Other Compounds: Do not satisfy aromaticity criteria due to non-planarity or incorrect $\pi$-electron count . Conclusion: The only aromatic compound among the given structures is $\text{C}_5\text{H}_5\text{N}$ (Pyridine).
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